Antenna



FIG. 1 is a front view of an antenna showing our new design;

FIG. 2 is a rear view thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof.

FIG. 7 is a perspective view thereof; and,

FIG. 8 is another perspective view thereof.

The broken lines illustrate portions of the antenna which form no part of the claimed design. 

CLAIM The ornamental design for an antenna, as shown and described. 